721386118449 has 8 divisors (see below), whose sum is σ = 1068720175520. Its totient is φ = 480924078948.

The previous prime is 721386118447. The next prime is 721386118471. The reversal of 721386118449 is 944811683127.

721386118449 is a `hidden beast` number, since 7 + 2 + 1 + 3 + 86 + 118 + 449 = 666.

It is not a de Polignac number, because 721386118449 - 2¹ = 721386118447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721386118395 and 721386118404.

It is not an unprimeable number, because it can be changed into a prime (721386118447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13359002167 + ... + 13359002220.

It is an arithmetic number, because the mean of its divisors is an integer number (133590021940).

Almost surely, 2^721386118449 is an apocalyptic number.

It is an amenable number.

721386118449 is a deficient number, since it is larger than the sum of its proper divisors (347334057071).

721386118449 is a wasteful number, since it uses less digits than its factorization.

721386118449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26718004396 (or 26718004390 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The spelling of 721386118449 in words is "seven hundred twenty-one billion, three hundred eighty-six million, one hundred eighteen thousand, four hundred forty-nine".